Orange Pi Zero and DHT11 Sensor

phyesix · Published in 2017-2-12 03:43:59

Hello everyone,
I'm the beginner in programming. I need use gpio pins in my Orange Pi Zero. I found the pyA20 library: orangepi_PC_gpio_pyH3: https://github.com/duxingkei33/orangepi_PC_gpio_pyH3 ... I bought the DHT11 sensor, but I could not get it to work in any way. Is there anyone working on this subject? I love it if there are sample codes?

Thanks

nopnop2002 · Published in 2017-2-12 12:45:04

Edited by nopnop2002 at 2017-2-12 13:10

A sample code of RPI+RPi.GPIO is here.

https://www.raspberrypi.org/forums/viewtopic.php?t=69427&p=505235

Transplantation from RPi.GPIO to orangepi_PC_gpio_pyH3 is the following procedure.

**RPi.GPIO**
# -*- coding: utf-8 -*-
import RPi.GPIO as GPIO
import time

COUNT = 3
PIN = 4
#GPIO.setmode(GPIO.BOARD)
GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN,GPIO.OUT)

for _ in xrange(COUNT):
GPIO.output(PIN,True)
time.sleep(1.0)
GPIO.output(PIN,False)
time.sleep(1.0)

GPIO.cleanup()

**orangepi_PC_gpio_pyH3**
# -*- coding: utf-8 -*-
from pyA20.gpio import gpio
from pyA20.gpio import port
import time

COUNT = 3
PIN = port.PA6
gpio.init()
gpio.setcfg(PIN, gpio.OUTPUT)

for _ in xrange(COUNT):
gpio.output(PIN,True)
time.sleep(1.0)
gpio.output(PIN,False)
time.sleep(1.0)

#gpio.cleanup()

BTW
When you use WiringPi-Python-OP, the same cord as RPI works with OPI.

https://github.com/lanefu/WiringPi-Python-OP

$ git clone https://github.com/zhaolei/WiringOP.git -b h3
$ cd WiringOP/
$ sudo ./build
$ cd $HOME
$ git clone --recursive https://github.com/lanefu/WiringPi-Python-OP.git
$ sudo apt-get install python-dev python-setuptools swig
$ cd WiringPi-Python-OP
$ swig2.0 -python wiringpi.i
$ sudo python setup.py install
$ cd tests
$ sudo python test.py

phyesix · Published in 2017-2-12 17:11:03

Edited by phyesix at 2017-2-13 18:32

I tried to translate the sample code in the forum you sent. For example:

gpio.setup(PIN, gpio.IN, pull_up_down=gpio.PUD_UP)

For example, how to translate this code block? My code block:

#!/usr/bin/env python
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector
from time import sleep
def bin2dec(string_num):
return str(int(string_num, 2))
data = []
#GPIO.setmode(GPIO.BCM)
PIN = port.PA6
gpio.init()
gpio.setcfg(PIN, gpio.OUTPUT)
gpio.output(PIN,gpio.HIGH)
sleep(0.025)
gpio.output(PIN,gpio.LOW)
sleep(0.02)
gpio.setup(PIN, gpio.IN, pull_up_down=gpio.PUD_UP)
for i in range(0,500):
data.append(gpio.input(PIN))
bit_count = 0
tmp = 0
count = 0
HumidityBit = ""
TemperatureBit = ""
crc = ""
try:
while data[count] == 1:
tmp = 1
count = count + 1
for i in range(0, 32):
bit_count = 0
while data[count] == 0:
tmp = 1
count = count + 1
while data[count] == 1:
bit_count = bit_count + 1
count = count + 1
if bit_count > 3:
if i>=0 and i<8:
HumidityBit = HumidityBit + "1"
if i>=16 and i<24:
TemperatureBit = TemperatureBit + "1"
else:
if i>=0 and i<8:
HumidityBit = HumidityBit + "0"
if i>=16 and i<24:
TemperatureBit = TemperatureBit + "0"
except:
print "ERR_RANGE"
exit(0)
try:
for i in range(0, 8):
bit_count = 0
while data[count] == 0:
tmp = 1
count = count + 1
while data[count] == 1:
bit_count = bit_count + 1
count = count + 1
if bit_count > 3:
crc = crc + "1"
else:
crc = crc + "0"
except:
print "ERR_RANGE"
exit(0)
Humidity = bin2dec(HumidityBit)
Temperature = bin2dec(TemperatureBit)
if int(Humidity) + int(Temperature) - int(bin2dec(crc)) == 0:
print Humidity
print Temperature
else:
print "ERR_CRC"

Copy code

In the meantime, as in the following photo: